After following the steps in the article on Crystal Reports Integration using the Crystal Reports Viewer, the only thing holding me back from seeing it work in my app is that I am receiving the following message when I open the report viewer page:

"Could not load file or assembly 'System.Web.Extensions, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)"

I am using ISD 5.2.1, VS2008, .NET 3.5 SP1, and the Crystal Reports tool included in VS2008.

Thanks for your kind reply.

Within the web.config file, the assembly settings are as shown in the snippet of code below. If you notice, the correct version (3.5.0.0) is being referenced.

It seems like some hidden code, maybe AJAX, is invoking 2.0.0.0 regardless of this definition. Somebody had replied in another thread that setting the System.Web.Extensions.dll reference to "Copy Local=True" would force the use of the right version. However, that requires converting the Web Site Project into a Web Application Project in Visual Studio and that carries its own slew of other issues.

By the way, since I'm using .NET 3.5, the right version of AJAX is also installed. Could Crystal Reports be the culprit?